<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 消息提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"> </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab导航栏 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <!-- 级联选择器 -->
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="{ expandTrigger: 'hover', ...cateProps }" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染时表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload :action="uploadUrl" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headersObj" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加用户按钮 -->
              <el-button type="primary" class="btnAdd" @click="add">添加用户</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 预览图片的对话框 -->
    <el-dialog title="预览图片" :visible.sync="preDialogVisible" width="50%" >
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      // 存放表单对象的值
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      // 表单的验证规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: blur }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: blur }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: blur }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: blur }],
        goods_cat: [{ required: true, message: '请选择商品的分类', trigger: blur }]
      },
      // 接受请求回来的商品数据
      catelist: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 存放动态参数列表数据
      manyTableData: [],
      // 存放静态参数列表的数据
      onlyTableData: [],
      // 上传图片的url地址
      uploadUrl: 'http://120.78.137.246:8888/api/private/v1/upload',
      // 图片上传组件的headers头对象
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 保存图片的临时url地址
      previewPath: '',
      // 控制预览图片的对话框的隐藏与显示
      preDialogVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获得商品数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('请求失败')
      this.catelist = res.data
      console.log(this.catelist)
    },
    // 离开当前的tab页 进行判断
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    // 只要级联选择器发生变化 ，这个函数就会执行
    handleChange () {
      console.log(this.addForm.goods_cat)
      // 级联选择器选择范围的控制
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    async tabClicked () {
      // 获取动态属性的数据
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) return this.$message.error('请求失败')
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        // 获取静态属性的数据
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) return this.$message.error('请求失败')
        this.onlyTableData = res.data
      }
    },
    // 处理图片的预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.preDialogVisible = true
    },
    // 删除图片
    handleRemove (file) {
      // 首先获取将要删除图片的临时路径
      const filePath = file.response.data.tmp_path
      // 然后从pic数组中找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex((x) => x.pic === filePath)
      // 调用数组的splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功后的事件
    handleSuccess (response) {
      // 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 将图片信息，push到pics数组当中
      this.addForm.pics.push(picInfo)
    },
    // 添加用户的按钮
    add () {
      // 添加商品前的数据校验
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单数据')
        // 执行添加的业务逻辑  深拷贝
        const form = _.cloneDeep(this.addForm)
        // 将数组转换为字符串
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发起请求添加商品
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 200) return this.$message.error('请求失败')
        this.$message.success('请求成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    // 计算属性 获得选了三级权限的id
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important ;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 20px;
}
</style>
